IQ: WHAT IS IT AND WHAT DOES IT MEAN? PRESENTED BY: ETHAN SCHWEHR, PHD NCSP LP LEARNING CENTER PSYCHOLOGIST DECEMBER 8, 2015 2015-2016 Workshop Series
IQ: WHAT IS IT AND
WHAT DOES IT
MEAN? PRESENTED BY: ETHAN SCHWEHR, PHD NCSP LP
LEARNING CENTER PSYCHOLOGIST
DECEMBER 8, 2015
2015-2016 Workshop Series
OVERVIEW
• What is IQ
• History and theory
• Definition
• Connections
• IQ Tests
• What is an IQ test?
• Common measures
• Analysis of the WISC-V
• How we use IQ now
• Profiles
• Applications
• Analyze some IQ data/profiles
HISTORY OF
INTELLIGENCE
• Sir Isaac Galton (1822-1922)
• James McKeen Cattell (1860-1944)
• Binet-Simon Scale (1905)
• Stanford-Binet (1916)
(Sattler, 2001)
THEORIES OF
INTELLIGENCE
• Cattell-Horn-Carroll Theory
• Sternberg’s Triarchic Theory
• Gardner’s Multiple Intelligence Theory
(Sattler, 2001)
CHC THEORY
Gf: Fluid intelligence
• General reasoning and inductive reasoning
Gc: Crystallized intelligence
• Knowledge and factual information, affected by acculturation
Gv: Visual processing
• Ability to manipulate and understand visual information
Ga: Auditory processing
• Skills needed to listen and respond
Gsm: Short-term memory
• Retaining and recalling information stored for short intervals
Glr: Long-term memory
• Retrieving information over longer periods of time
Gs: Processing speed
• Ability to scan and react to simple tasks quickly
Gt: Decision speed
• Reacting or answering questions quickly with slight to moderate difficulty
Gq: Quantitative knowledge
• Understanding and applying mathematical concepts
• Most intelligence tests are constructed based on this theory
• Overall intelligence level is g
• Usually 9 to 10 subarea abilities
(Sattler, 2001)
GARDNER’S MULTIPLE
INTELLIGENCES
Linguistic Intelligence
• Language and communication
Musical Intelligence
• Rhythmic and pitch
Logical-Mathematical Intelligence
• Logical reasoning
Spatial Intelligence
• Perceiving and modifying perceptions
Bodily-Kinesthetic Intelligence
• Dancing, acting, athletics
Intrapersonal Intelligence
• Knowledge of self and feelings
Interpersonal Intelligence
• Understanding and knowing other’s feelings and thoughts
Naturalist Intelligence
• Find patterns in nature
(Sattler, 2001)
STERNBERG’S
TRIARCHIC THEORY
Metacomponents
• Used for planning, monitoring, and evaluating performance of
a task
Performance Components
• Strategies used to execute a task
Knowledge Acquisition Components
• Used to learn new things
• Selecting encoding
• Selective combinations
• Selective comparisons
(Sattler, 2001)
SO WHAT IS IQ?
• David Wechsler stated intelligence is, “the capacity of the individual to act purposefully, to think rationally, and to deal effectively with his environment”
• According to Dictionary.com: capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths, relationships, facts, meanings, etc.
• Intelligence quotient: Mental Age
Chronological Age
• We use IQ assessments to gather information for intervention, diagnoses
• Strong predictive utility
X 100
(Wechsler, 2014)
BELL CURVE
BASIC STATISTICS
Scores are generally provided as standard scores
• Mean or average of 100
• Standard deviation of 15
Percentiles are often provided to assist with score interpretation
• 70 = 2nd %
• 90 = 25th %
• 100 = 50th %
• 110 = 75th %
• 130 = 98th %
Relationship Reared Together Reared Apart
Identical Twins .86 .76
Fraternal Twins .55 .35
Biological Siblings .47 .24
Unrelated Siblings .30 --
Parent and Offspring .42 .24
Parent and Adoptive
Children
.30 --
HEREDITABILITY
(Sattler, 2001)
ENVIRONMENTAL FACTORS
OF INTELLIGENCE
• Prenatal care
• Nutrition
• Poverty
• Family background
• Stimulation
• Punishment
• Unemployment
STABILITY
For the most part, IQ tends to remain stable.
• By 5 or 6, IQ scores tend to become more stable with an
increase in predictive utility (.50 correlation with educational
attainment by the age of 7 or 8)
• Large variations can occur
• Up to 20-point variations
• Adoption studies have shown 10- to 12-point gains
• Various studies indicate positive thinking about improving IQ
can result in higher scores
Gender differences
• Mainly equal
Gains over time (Sattler, 2001)
CORRELATIONS WITH IQ
Mortality
• Inverse relationship between early life IQ and mortality
• Plays a factor in socioeconomic inequalities in health (Batty et al., 2006)
Functional decline
• Those with higher IQs tend to have less functional decline as they age compared to those with lower IQs (Bosma et al., 2007)
General life outcomes
• IQ scores at age 13 are good predictors of attained education, occupational status, and material well being (Firkowska-Mankiewicz, 2011)
IQ has a strong connection with schooling and academic skills (Ceci & Williams, 1997)
• This in turn leads to better income and job outlook
• A college graduate will earn 31% more than a high school graduate of equal verbal abilities
• The WISC-V has a .80 correlation with the KTEA-3 and WIAT-III overall achievement
Job performance
SO WHAT IS AN IQ TEST?
• Online Measures
• Often inaccurate or only measure one aspect of IQ
• IQ-test.com: 133 to 149 (matrix problems)
• Free-iqtest.net: 140 (various types of problems)
• Standardized Measures
• Have been normed on many individuals
• Have excellent technical characteristics
• Reliability
• Validity
• Have strong predictive utility
COMMON IQ TESTS
Wechsler assessments
• Wechsler Intelligence Scale for Children-Fifth Edition (WISC-V) (6-16)
• Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) (16-90)
• Wechsler Preschool and Primary Scale of Intelligence-Fourth Edition
(WPPSI-IV) (2:6-7:7)
Kaufman Assessment Battery for Children-Second Edition (KABC-II)
(3-18)
Stanford-Binet Intelligence Scales-Fifth Edition (SB5) (2-85+)
Woodcock-Johnson-Fourth Edition (WJ-IV) Tests of Cognitive
Abilities (2-80+)
WISC-V OVERVIEW
FIVE MAIN COMPOSITES
Verbal Comprehension Index (VCI)
• Ability to access and apply acquired word knowledge
• Gc
Visual Spatial Index (VSI)
• Evaluate visual details and understand visual spatial relationships
• Gv
Fluid Reasoning Index (FRI)
• Detecting underlying conceptual relationships among visual objects
• Gf
Working Memory Index (WMI)
• Register, maintain, and manipulate visual and auditory information
• Gsm
Processing Speed Index (PSI)
• Speed and accuracy of visual identification and decision making
• Gs
FSIQ: Similarities, Vocabulary, Block Design, Matrix Reasoning, Figure Weights, Digit Span, and Coding
SUBTEST SCORES
VCI
• Similarities* (describe how two words are similar)
• Vocabulary* (define vocabulary terms)
• Information (answer questions about general-knowledge topics)
VSI
• Block Design* (copy block designs)
• Visual Puzzles* (mentally construct puzzles)
FRI
• Matrix Reasoning* (select missing piece to complete matrix or sequence)
• Figure Weights* (select responses to balance a scale)
• Picture Concepts (view two or three rows of pictures and pick similar pictures among the rows)
• Arithmetic (mentally solve math problems)
WMI
• Digit Span* (recall sequence of digits in various orders)
• Picture Span* (presented with pictures then asked to recall them among many more pictures)
• Letter-Number Sequencing (given sequence of letters and numbers and repeat them with numbers first then letters)
PSI
• Coding* (use key to copy symbols corresponding with numbers)
• Symbol Search* (scan groups to identify target symbol)
• Cancellation (mark objects in random and sequenced presentations)
(Wechsler, 2014)
COMPLIMENTARY
SUBTESTS
• Naming Speed
• Literacy
• Quantity
• Storage and Retrieval
• Immediate
• Delayed
• Recognition
COMMON PROFILES
• ADHD
• Lower scores on WMI and PSI
• Common lower scores on Digit Span (WMI) and Coding (PSI)
• English Learners
• High functioning autism
• Lower scores on the WMI and PSI
• Learning Disabilities
• Tend to have statistically lower scores across each index for populations with reading/writing/math disorders
• Math and Reading
• Math tends to be correlated with nonverbal reasoning
• Reading/writing is more connected with verbal reasoning
COMMON APPLICATIONS
OF IQ TESTS
• Giftedness
• FSIQ ≥ 130
• Intellectual Disability
• FSIQ ≤ 70 ± 5
• Also need to display deficits in adaptive behavior
• Learning Disabilities
• Only in schools within certain states
• Newer definitions of learning disabilities only require
information from academic deficits
LEARNING DISABILITIES IN
SCHOOLS IN MINNESOTA
• Three components
• Underachievement • Oral expression, listening comprehension, written expression,
basic reading skills, reading comprehension, reading fluency, mathematics calculation, mathematical problem solving
• AND
• Processing deficits • Storage, organization, acquisition, retrieval, expression,
manipulation
• AND
• Severe discrepancy • Mathematical calculation of difference between cognitive
functioning and academic skills
• OR
• Inadequate rate of progress • Response to Intervention (RTI)
PRACTICE IQ PROFILES
Index Score Percentile Rank
Verbal Comprehension Index 72 3
Visual Spatial Index 79 8
Fluid Reasoning Index 73 4
Working Memory Index 67 1
Processing Speed Index 80 9
FSIQ 71 3
PRACTICE IQ PROFILES
Index Score Percentile Rank
Verbal Comprehension Index 108 70
Visual Spatial Index 89 23
Fluid Reasoning Index 86 18
Working Memory Index 97 42
Processing Speed Index 94 34
FSIQ 95 37
PRACTICE IQ PROFILES
Index Score Percentile Rank
Verbal Comprehension Index 118 88
Visual Spatial Index 112 79
Fluid Reasoning Index 122 93
Working Memory Index 86 18
Processing Speed Index 96 40
FSIQ 110 75
PRACTICE IQ PROFILES
Index Score Percentile Rank
Verbal Comprehension Index 83 13
Visual Spatial Index 97 42
Fluid Reasoning Index 98 45
Working Memory Index 92 30
Processing Speed Index 103 58
FSIQ 93 32
REFERENCES
Batty, G. D., Der, G., Macintyre, S., & Deary, I. J. (2006). Does IQ explain socioeconomic inequalities in health? Evidence from a population based cohort study in the west of Scotland. BMJ, 332, 580-584.
Bosma, H., PJ van Boxtel, M., IJM Kempen, G., ThM van Eijk, J., & Jolles, J. To what extent does IQ ‘explain’ socio-economic variations in function? BMC Public Health, 7, 179.
Ceci, S. J., & William, W. M. (1997). Schooling, intelligence, and income. American Psychologist, 52, 1051-1058.
Firkowska-Mankiewicz, A. (2011). Adult careers: Does childhood IQ predict later life outcome? Journal of Policy and Practice in Intellectual Disabilities, 8, 1-9.
McGrew, K. (2010). New directions in neuropsychological assessment: Augmenting neuropsychological assessment with CHC cognitive measures [PowerPoint Slides]. Retrieved from: http://www.slideshare.net/iapsych/new-directions-in-neuropsychological-assessment-augmenting-neuropsychological-assessment-with-chc-cognitive-measures
Sattler, J. (2001). Assessment of children: Cognitive applications. (4th ed.). San Diego, CA: Jerome M. Sattler, Publisher, Inc.
Wechsler, D. (2014). Wechsler intelligence scale for children. (5th ed.). Bloomington, MN: PsychCorp.